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佛开高速公路拓宽工程的关键技术问题之一是软基路堤的地基处理和拼接。通过试验段工程进行了路基拼接和拓宽时,不同复合地基处理方法的原型试验,研究表明,搅拌桩地基下卧层的单位压缩量小于素混凝土桩地基,拓宽路基断面的最大沉降和最大沉降速率出现在素混凝土桩加固区;老路对拓宽路堤的荷载反应敏感,老路最大沉降速率出现在拓宽路堤荷载施加完成之后;拓宽路基具有比较小的工后沉降,所采用的地基处理方法和路基拼接方法满足设计要求。
One of the key technical issues of Fokai Expressway widening project is the foundation treatment and splicing of soft foundation embankment. Through the pilot project, the prototype tests of different composite foundation treatment methods were carried out when the subgrade was spliced and broadened. The results show that the unit compression of subsoil under mixing pile is smaller than that of plain concrete piles and broadens the maximum settlement and maximum settlement rate Appears in the reinforcement zone of plain concrete piles. The old road is sensitive to the widening of the embankment load. The maximum settlement rate of the old road appears after the railway embankment has been widened. The widening of the roadbed has less post-construction settlement. The ground treatment method and subgrade stitching method Meet the design requirements.